Ola,
When you create the Request in the admin area of JFBConnect, at the bottom of each Request configuration/edit page is the actual {JFBCRequest request_id=xyz} tag you'll want to use. There's extra options you can use, but must specify the Request ID either in the module or the tag of the Request that you have configured and want to send.
If that's not the issue, just let us know!
Thanks,
Alex